You warp into a small area, 5 groups are very close to you and you get aggro from the group behind you at warp-in. Since the groups are so close it was tricky to prevent the other groups aggro my drones. Happend a few time, I just returned them and the groups went back to their original place even if they were 1km from me.

Blitz:Pocket 1: destroy all ships to unlock gatePocket 2: destroy all ships to unlock gatePocket 3: destroy only ships in group 3 - no other ships are needed to complete mission (tagging ships makes live easier after stage-aggro)